Norman Foster is the only architect listed in the Sunday Times Rich List 2012, reports BDonline.
Foster, who owns a 45% stake in Foster & Partners, fell some 50 places to 501, with his wealth estimated at 150 million pound.
James Dyson, RCA industrial design graduate, came in at number 22 on the annual list with a fortune of 2.65 billion pound, an increase of 1.2 billion pound compared to last year.
Zaha Hadid, who last year featured on the list for the first time, did not make the cut in 2012.